Commissariat a L'energie Atomique

Commissariat a L'energie Atomique Et Aux Energies Alternatives

Centre National De La Recherche Scientifique

Renault S.a.s.

Commissariat a L'energie Atomique Et Aux Energies

Carole Bourbon

Sébastien Patoux

Frédéric Le Cras

Frederic Le Cras

Jean-François Colin

Sébastien Martinet

Séverine Jouanneau

Didier Bloch

David Peralta

Sebastien Patoux

Lise Daniel

Sylvain Franger

Carole Pagano

Mehdi Moussavi

Nathalie Herlin-Boime

Celine Barchasz

Antoine Nowodzinski

Céline Barchasz

Sébastien Launois

Séverine Jouanneau-Si Larbi

Patrick Rozier

Helene Lignier

Gilles Gauthier

Hélène Lignier

Valérie Pralong

Mickael Dolle

Loic Simonin

Jérémie Fondard

Franck Rouppert

Fr&eacute;d&eacute;ric Le Cras

Severine Si Larbi Jouanneau

Quentin Jacquet

Barbara Le Roux

Sebastian Patoux

Erwan Dumont-Botto

Lucas Sannier

Yves-Gregoire Assouan

Yves-Grégoire Assouan

An electrochemical cell for an accumulator operating according to the principle of forming an alloy with the active material of the negative electrode during the charge process comprising: a negative electrode comprising, as active material, a material alloyable with an element M, M being a metal element; a positive electrode comprising, as active material, a conversion material; an electrolyte comprising at least one salt of M disposed between the negative electrode and the positive electrode.

Specific electrochemical cell for accumulator operating according to the principle of forming an alloy with the active material of the negative electrode comprising a specific pair of electrodes

A method for preparing a positive electrode active material for a lithium battery consisting of a lithiated oxide comprising titanium and optionally one or more other metal elements comprising the following successive steps: a) a step of forming a precipitate comprising titanium and the optional other metal element(s) by contacting a titanium coordination complex and, if necessary, at least one salt of the other metal element(s) with an aqueous medium; b) a step of recovering the precipitate thus formed; c) a step of calcining the precipitate in the presence of a lithium source.

Method for preparing a positive electrode active material of the lithiated metal oxide type comprising titanium

Positive electrode material for a lithium battery comprises a lithiated metal layered oxide comprising metal elements arranged in layers of metal cations and lithium arranged in interlayers of lithium cations and, in part, in the layers of metal cations, the oxide has a stack arrangement 02 and corresponds to the formula (I): Li(a+b)NicMndCoeMfOg (I) wherein: *a represents the proportion of lithium in the interlayers, 0&#x3c;a&#x3c;1; *b represents the proportion of lithium in the layers of metal cations, 0&#x3c;b&#x3c;&#x2153;; *c, d, e and f are between 0 and 1 and b+c+d+e+f=I; *1.9&#x3c;g&#x3c;2.1; *when f&#x2260;0, M is one or more of Al, Fe, Ti, Cr, V, Cu, Mg, Zn, Na, K, Ca, Sc; wherein the oxide is coated with an oxide of the formula (II): MnhM'iO2 (M) wherein: *0&#x3c;h&#x2264;1.5, preferably h=1; *M&#x2032; is one or more of Ni, Al, Fe, Ti, Cr, V, Cu, Mg, Zn, Na, K, Ca, Sc; *0&#x2264;i&#x2264;1.5.

Positive electrode material based on a lithiated layered oxide coated, in whole or in part, with another manganese-based oxide, and method for the preparation thereof

An electrode material of formula LiNiTiNbOwhere:

Cathode material for Li-ion batteries

The present invention relates to an electrode material of formula LiMnCoBO, where 0&#x3c;&#xd7;&#x3c;1, and to a method of preparing the same comprising independently preparing a manganese borate and a cobalt borate and then simultaneously thermally treating them under an inert atmosphere, in the presence of a precursor of lithium and of boric acid.

[object Object]

A method for preparing a mixture of a powder of an electrode active compound and of a powder of an electron conducting compound is disclosed. According to some aspects, the method includes preparing a liquid medium containing the powder of the electrode active compound and the powder of the electron conducting compound, subjecting the liquid medium containing the powder of the electrode active compound and the powder of the electron conducting compound to the action of high energy ultrasonic waves, removing the liquid medium, and collecting the mixture of the powder of the electrode active compound and of the powder of the electron conducting compound. According to some aspects, an electrode including the mixture as an electrochemically active material, a cell including the electrode, and an accumulator or battery including one or more of these cells are disclosed.

Method for preparing a mixture of an electrode active compound powder and an electronic conductor compound powder, resulting mixture, electrode, cell and battery

A two-phase positive electrode material for a lithium battery in which particles of lithium-enriched layered oxide of formula Li(MnNiM)Oare at least partially coated on the surface with a metal oxide of formula LiVO. Such a material is advantageously produced by mixing the lithium-enriched lamellar oxide with at least one precursor of the metal oxide in aqueous solution, followed by thermal treatment at a temperature no lower than 280&#xb0; C.

Two-phase positive electrode material for a lithium battery and method for the synthesis of same

A method for producing a composite sulphur/carbon conductive material obtained solely from an initial sulphur and an initial carbon which includes the following successive steps between 50% and 90% by weight of initial sulphur and between 50% and 10% by weight of initial carbon having a specific surface smaller than or equal to 200 m/g are placed in a reactor at atmospheric pressure, the sum of the proportions respectively of the initial sulphur and carbon attaining 100%, the reactor is hermetically sealed at atmospheric pressure, and the composite sulphur/carbon conductive material is formed, in powder form, by heat treatment by heating said reactor to a heating temperature comprised between 115&#xb0; C. and 400&#xb0; C., without external regulation of the pressure inside the reactor, and keeping said reactor at said heating temperature during a predetermined time.

Composite sulphur/carbon conductive material, use as an electrode and method for producing such a material

The invention relates to a positive electrode/electrolyte pair for lithium batteries operating at a voltage above 4.2 V versus Li+/Li. The electrolyte of the lithium battery used in the invention includes at least a first additive chosen from optionally substituted, cyclic or acyclic, carboxylic or dicarboxylic anhydrides and carboxylic or dicarboxylic acids, and mixtures thereof, and optionally a second additive which is a lithium salt, the total content of additive(s) being greater than or equal to 0.01% by weight and less than or equal to 30% by weight, relative to the total weight of electrolyte, and the positive electrode is made of a material having a spinel structure. The lithium batteries of the invention are applicable in particular in the field of portable equipment, such as telephones, computers, camcorders, cameras and tooling.

Non-aqueous electrolyte for a high-voltage lithium battery

A method of synthesis of a metal fluorophosphate having the following general formula (1): XM(PO)F(1), in which: X is an alkaline metal selected among sodium (Na) and lithium (Li) or a mixture of said metals; M is a transition metal selected among the following elements: Co, Ni, Fe, Mn, V, Cu, Ti, Al, Cr, Mo, Nb or a combination of at least two of said metals, 0&#x2266;a&#x2266;5; 0.5&#x2266;b&#x2266;3; 0.5&#x2266;c&#x2266;3; and d is an integer equal to 1, 2 or 3. The method contains an electric-field-activated sintering process for a mixture (1) formed by at least one first phosphate-containing solid precursor and at least one second fluorine-containing solid precursor.

Metal fluorophosphate synthesis and use as an active material for a battery electrode

Process for the preparation of an insertion compound of an alkali metal in which the following successive stages are carried out:

Method for preparing insertion compounds of an alkali metal, active materials containing same, and devices comprising said active materials

A material or compound is provided having a spinel structure and corresponding to the formula LiNiMnMnAO, where:

Optimised positive electrode material for lithium cell batteries, method for the production thereof, electrode, and battery for implementing said method

The LiMPOcompound is synthesized by reacting a compound of general formula XMPO, nHO where X represents a radical selected from &#x2014;NHand &#x2014;H and M is a transition metal selected from Co, Ni and Mn, with a lithium source such as lithium nitrate, at a temperature lower than or equal to 350&#xb0; C. The XMPO, nHO compound further exhibits a particular morphology in the form of platelets that is preserved during the reaction between the two precursors. The LiMPOcompound thus synthesized is advantageously used as active material of an electrode for a lithium storage battery.

A lamellar-type oxide, in particular used as active material of a positive electrode for a lithium battery and to a method for synthesizing such an oxide. The oxides are used as active materials for the positive electrode of a lithium battery. With such oxides, the specific capacity of a lithium battery is improved and stabilized on cycling.

Positive electrode material formed by a lamellar-type oxide for a lithium battery

A non-volatile electrochemical memory cell formed of a stack of thin films comprising at least one first active layer, suited to releasing and accepting, in a reversible manner, at least one ion species, at least one second active layer, suited to releasing and accepting said ion species, in a reversible manner, the active layers being based on materials having different compositions and electrochemical potential profiles.

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Saint-Michel de Saint-Geoirs, France

Carole Bourbon